The diseases of corn leaves mainly include Curvularia leaf spot, Leaf spot, Southern rust, and Sheath blight in our province. Recently, the province's corn-producing areas have more rainy weather and higher humidity in the fields. In addition, the corn plant is tall and the field is covered with shelter cover, which is conducive to the spread of corn leaf disease. It is expected that the corn leaf disease will be moderate in the province, and early summer sowing of corn fields will occur. Prevention and technical advice are as follows:
1. Agricultural control: Strengthen the middle cultivator and weeding in the middle and late corn field, timely remove the diseased leaves from the lower part of the plant, and bring it out of the field for centralized treatment; pay attention to drainage in a low-lying manner to improve the microclimate in the corn field; apply chemical fertilizers in a suitable period to improve plant resistance; To control and reduce corn leaf disease.
Second, chemical control:
1. Control period. From late August to mid-September.
2. Control indicators. The rate of corn leaf spot disease is 10%.
3. Control object fields. Summer corn field sown before June 25th.
4. Control agents. Mu 10 mg of active ingredient of triadimefon, 6.25 g of active ingredient of diniconazole, 45 g of active ingredient of daisammon, and spray of 30 to 40 kg of water.
5. Spray foliar fertilizer. After the onset of severe disease, the disease can be controlled and potassium dihydrogen phosphate or other foliar fertilizers can be sprayed to restore the damaged corn plants as soon as possible.
6. Precautions. If the meteorological conditions are favorable and the disease develops rapidly, use the above-mentioned fungicides for treatment. Wear protective clothing and gloves and masks when spraying. At the same time, avoid operating during high temperatures and prevent poisoning and heatstroke.
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